| commit | 221e9d389ce2fd2f730d7230f9a3f67b12aabd9d | [log] [tgz] |
|---|---|---|
| author | Eunchan Kim <eunchan@opentitan.org> | Thu Dec 03 13:43:12 2020 -0800 |
| committer | Eunchan Kim <eunchan@opentitan.org> | Fri Dec 04 14:43:13 2020 -0800 |
| tree | 80ad106467499b99d466662fedd68b896339a338 | |
| parent | 4fc0b2196c60ba6b19a29039fe6a54861079bb18 [diff] |
[kmac] Revise to release MsgFIFO access when Idle
Problem:
When Idle or KeyMgr is in operation (KDF), Sw access to MsgFIFO
hangs the interconnect.
`kmac_keymgr` drops the `sw_ready_o` if `mux_sel` is not `SelSw`. The
mux is switched to the software when KeyMgr is not operating and the
software issues `CmdStart`.
In this case when the mux is not switched to the software, if the
software writes data into the Msg FIFO, the keymgr interface module
never asserts the ready. So, there's no way for software to release this
condition, as the software cannot issue CmdStart.
This commit is to fix the behavior by asserting the ready always. Then
it also creates an error code for this scenario so that the software
knows what it did wrong.
This is related to issue #4409
Signed-off-by: Eunchan Kim <eunchan@opentitan.org>
OpenTitan is an open source silicon Root of Trust (RoT) project. OpenTitan will make the silicon RoT design and implementation more transparent, trustworthy, and secure for enterprises, platform providers, and chip manufacturers. OpenTitan is administered by lowRISC CIC as a collaborative project to produce high quality, open IP for instantiation as a full-featured product. See the OpenTitan site and OpenTitan docs for more information about the project.
This repository contains hardware, software and utilities written as part of the OpenTitan project. It is structured as monolithic repository, or “monorepo”, where all components live in one repository. It exists to enable collaboration across partners participating in the OpenTitan project.
The project contains comprehensive documentation of all IPs and tools. You can access it online at docs.opentitan.org.
Have a look at CONTRIBUTING for guidelines on how to contribute code to this repository.
Unless otherwise noted, everything in this repository is covered by the Apache License, Version 2.0 (see LICENSE for full text).